Screw-jack.



J. W. SNIDER.

SCREW JACK. APPLICATION FILED 00121091013.

Patented Aug. 4, 19141 J h/jfi/Jer lV/TNESSES INVENTOR 1 Till: NUA'RF PElE/M co :1 ulHou WASHINGTON, u L.

UNITED} STATES Parana. curren .ioi-m w. smnna, or BENTON, NORTH CAROLINA.

SCREWJACK.

Specification of Letters Patent.

Patented Aug. 4:, 1914.

Application filed October 10, 1913.1 Serial No; 794,480.

To all whom it mar concern Be it known that. I, JOHNW. SNIDER, a citizen of the United States, residing at Denton, in the county of Davidson and State of North Carolina, have invent-ed certain new and useful Improvements in Screw- Jacks; and I do hereby declare the following to be afull,clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make andquse the same.

This invention relates to lifting jacks,

working parts, and which will not be likely to get out of order.

With these and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter more fully described and claimed and illustrated in the 1 accompanying drawings, 1

in which like reference characters indicate like parts throughout the several views, and in which,

Figure 1, represents a vertical elevational view of the jack. Fig. 2, represents a vertical sectional view. onthe line 2-2 :of Fig. 1,.

showing the jack in operation. Fig. 3,represents a horizontal sectional View on the line 33of Fig. 1.

In constructing a jack according to my invention,I provide a long flat substantially wide bar 5, which has its ends rounded as at 6, and which supports vertical spaced guide bars 7 the latter being connected at their upper ends by a heavy cross ,bar SJ Brace rods 9, are secured in the ends of cross bar 8, which extends beyond guide bars 7, and connect said crossbar with the outer ends of base 5, said brace rods diverging downwardly and substantially bracing, the ack.

A lifting frame is adapted to slide up and down between guide bars 7 ,and said frame comprises upper and lower beams 10, connected at their ends by vertical. beams 11,

and 1 intermediate their ends by vertical 1 bolts 12, the latter being spaced from each other and from beams 11.. Bolts 14, connect the beams 10, and rest against the end beams 11 for bracingthe same. The outer ends of beams 10, and the outeredges of beams 11, are plane, and rest against the inner faces of guide bars 7, and the beams 11 are provided with guide plates 13 which engage on opposite sides of the guide bars, whereby the liftingframe may be guided in its movements.

Alongdifting screw 15, extends centrally through the upper cross beam 10, and is se cured thereto by means of 1a nut 16, and

screw 15 ex-tendsthrough an opening centrally of cross bar 8, and through a bearing plate 19, secured to said cross bar, and a threaded nut 20 is provided on the upper end of screw 15, and bears against plate 19, said nut being provided with oppositelyextending arms 21, whereby the nut may be rotated for raising the sash. said arms at their outer ends being bent upwardlyto provide hand holds.

An eye bolt 22 and a hook22. are secured horizontally in beam 10 of the frame and on opposite sides ofthe center thereof and as illustrated inFig. :2, said bolt and hookare.

adapted toco-act with a chain 23, in securmg a wheel 24, 01? a threshing-machine or the like to the lifting frame, sald chains 23 beingsecured at one end to the bolt and being passed between the spokes of the wheel under and around the hub, and crossed on to of the hub bctweenythe spokes and secured'to the hook, thus holdingthehub in contiguous relation with. the supporting frame, said hub resting on the lower cross beam 10, of said frame, but the chainmight be otherwise secured to the hub, the nature and construction of the wheel determining the best manner in which the chain should be secured thereto.

By the use of my improved jack, the wheels of a vehicle may be raised to any exact predetermined distance from the ground within the limitations of the path of the supporting frame, and the wheels will be held in raised positionand cannot :accidentally be removed or detached from the jack. The use of my jack will save much time and trouble by eliminating the necessity of blocking a vehicle or threshing machine, by reason of the fact that the base 5, affords a large bearing surface to the grouhdyand it is noted that no specia1'adjustment; of set screws or levers or other Althoiw'h I have described the referredf embodiment of my mvention, I may desire to make such changes in the construction, combinatlon and arrangement of parts," as

do notdepart fromthe spirit of the inven-f ingmeans for said chain. 7 1 "In testlmony whereof I have signedamy 30 tion and the scope of the appended claim.

Having thus fully described my invenq tion, What I claim as new and desire tovse-j cure by Letters-Patent is: k A lifting jack comprising: a base, guidej bars supported thereby, a cross bar connect-E sing said guide bars,ja lifting-frame slidablef between said guide bars, said frame comprising spaced Cross bars, and spaced Verti cal bars connecting said cross 'bars,a.;1ifting 20 screw connectedto-smd hftmg frame, sa d screw extending through the cross barf secured to the upper ends of said guide bars,

adapted to be operated bygmeansof a "nut, a. chain. adapted to pass around the hub 25 o-fa wheel for securing the same to theiift ing frame, said hub: adapted to rest againstthe lower cross bar of said frame, and seem;

name to this specification in the presence of two subsorlbing'witnesses.

Witnesses:

WILLAM R. SNI ER, JOHN O; GARNER.

- Copiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patenh Washington; D, G.

JOHN W. sNiDERj .1 

